Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff260a4a20358a0…

MALICIOUS

PDF

76.2 KB Created: 2021-06-08 20:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57a59175f57a35d57f06f52b78c09963 SHA-1: d1128e5dd702792793fd14deadeacb83726aca41 SHA-256: cff260a4a20358a0b7a4d05ea302554e5c3558138416c0398e8ac4208ee7e2d9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/pbw?utm_term=y2met+com+download+2020 PDF link annotation
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/6194372.pdfIn PDF document text
    • https://ziwojezevuvige.weebly.com/uploads/1/3/4/5/134500989/pisexizizoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fdf323c3f2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6044915261848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_601598b2c56c3.pdfIn PDF document text
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/gopomuvoraro_tigorobalufol_madozomig.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/7859f.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/moguvenu.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/roratorowopi.pdfIn PDF document text
    • https://moxolodoxezem.weebly.com/uploads/1/3/4/6/134678964/5309000.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/ed84615ba0.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/totin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fedf5eb850f7.pdfIn PDF document text
    • https://fufagefi.weebly.com/uploads/1/3/4/6/134638184/jopimolaxow.pdfIn PDF document text
    • https://zukujiwad.weebly.com/uploads/1/3/4/4/134491014/dfa586af00aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_6022cbc39bb9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/23ed5fc0-c6bf-42e6-b0d2-a8c8421107ff/delonghi_air_conditioner_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c98b1a-484c-4b7b-8427-ad105f00fe05/kudupimuronadipejewumulug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdf00bd-d248-442a-8ea1-015045fe871e/should_i_use_c_or_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148dc598-b30e-4fa7-b3fe-ba3f7a9fea33/what_is_a_good_microwave_brand_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c65d069-559f-4f5d-96ca-1bc5143c12a4/vepukoxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778161f9-cd7d-41b9-9043-759bd753c287/what_diet_is_good_for_eczema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d848ac62-cd75-4c0b-b33e-5c9d804cf1de/9905454560.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 4876 bytes
SHA-256: 217abec20b98409b22424eacbf5c770954c9783c61b05fc009a0896ccf7c6644
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10584 bytes
SHA-256: 8eb76ffa8f67908e3e51ff43792b4263232135469c93cebafe57d9279c7f0b88
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361